If you are setting up your Linux PC as a PPP server, you must compile in
IP forwarding support. This is also necessary if you want to use Linux
to link to LANs together or your LAN to the Internet.
If you are linking a LAN to the Internet (or linking together two LANs), you
should be concerned about security. Adding support for IP fire walls to
the kernel is probably a MUST!
You will also need this if you want to use IP masquerade to connect a
LAN that uses any of the above mentioned 'unconnected' IP network
numbers.
To enable IP Masquerade and IP fire walling, you MUST answer yes to the
first question in the make config process:-
Prompt for development and/or incomplete code/drivers (CONFIG_EXPERIMENTAL)? |
Whilst this may sound a bit off-putting to new users, many users are
actively using the IP Masquerade and IP fire walling features of the
Linux 2.0.x or 2.2.x kernels with no problems.
Once you have installed and rebooted your new kernel, you can start
configuring and testing your PPP link(s).
Take our 
